2013
DOI: 10.1002/etep.1777
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A novel technique for internal fault detection of power transformers based on moving windows

Abstract: SUMMARY Power transformer differential relays may incorrectly operate due to inrush condition or transformer external faults lead to current transformer (CT) saturation. In this paper, a new technique is presented to distinguish internal fault current from magnetizing inrush current in power transformers. The proposed technique applies two moving windows which both of them estimate magnitude of transformer differential current using different methods. The first moving window method is based on full‐cycle Fouri… Show more

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Cited by 9 publications
(6 citation statements)
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“…So, the standard differential protection is not able to identify the ultra-saturation phenomenon, and the description and control of the ultra-saturation phenomenon is necessary for preventing the false trip of the differential protection. Also, several studies have been carried out to distinguish between the inrush current and the internal and external faults by various algorithms [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], but none has taken the ultra-saturation phenomenon into account. This paper presents a new model for investigating the ultra-saturation phenomenon during energization of a loaded three-phase power transformer.…”
Section: Simulation Of the Inrush Current In An Unloaded Power Transfmentioning
confidence: 99%
See 1 more Smart Citation
“…So, the standard differential protection is not able to identify the ultra-saturation phenomenon, and the description and control of the ultra-saturation phenomenon is necessary for preventing the false trip of the differential protection. Also, several studies have been carried out to distinguish between the inrush current and the internal and external faults by various algorithms [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], but none has taken the ultra-saturation phenomenon into account. This paper presents a new model for investigating the ultra-saturation phenomenon during energization of a loaded three-phase power transformer.…”
Section: Simulation Of the Inrush Current In An Unloaded Power Transfmentioning
confidence: 99%
“…Several studies have been carried out to distinguish internal faults from external faults and the magnetic inrush current by various algorithms such as the harmonic restraint and the park transform . Also, some works have used special algorithms such as the support vector machine‐based protection scheme , the self‐adaptive transformer differential protection , the time‐domain analysis of differential power signal , the inner bridge connection , the standard 87T differential protection for power transformer and special power transformer , intelligent hybrid systems , moving windows , S‐transform , time‐frequency analysis , differential evolution , negative sequence analysis , and S‐transform and fuzzy expert systems to distinguish between the transient phenomena. But none of these studies have modeled the ultra‐saturation phenomenon.…”
Section: Introductionmentioning
confidence: 99%
“…There are many methods reported for the identification of internal faults from the operating conditions of the system. Methods such as the differential current gradient, empirical Fourier transforms, parks vectors, geometrical structural analysis of waveform, wavelet transform probability concept and decision tree‐based discrimination, moving windows, and voltage and current ratios are proposed to discriminate internal faults from external faults, inrush, and over excitation conditions. Harmonic restraint methods are commonly used in industries for the detection of inrush and over excitation conditions of the transformers.…”
Section: Introductionmentioning
confidence: 99%
“…In order to successfully compete in a global economy, transformer manufacturers need to continuously improve transformer design to save material and reduce cost. Because it is easier to insulate, traditionally the low voltage (LV) winding is placed closer to the core and the high voltage (HV) winding covers the LV winding . In this paper, this conventional arrangement of windings is called L‐H configuration.…”
Section: Introductionmentioning
confidence: 99%